feat(deployments): add support for Coolify variables in Dockerfile

- Introduced functionality to add Coolify variables as ARGs in the Dockerfile during the build process.
- Enhanced the existing method to handle both standard environment variables and Coolify-specific variables, improving deployment flexibility.

app/Jobs/ApplicationDeploymentJob.php

@@ -2890,6 +2890,17 @@ private function add_build_env_variables_to_dockerfile()
                         $dockerfile->splice(1, 0, ["ARG {$env->key}={$env->real_value}"]);
                     }
                 }
+                // Add Coolify variables as ARGs
+                if ($this->coolify_variables) {
+                    $coolify_vars = collect(explode(' ', trim($this->coolify_variables)))
+                        ->filter()
+                        ->map(function ($var) {
+                            return "ARG {$var}";
+                        });
+                    foreach ($coolify_vars as $arg) {
+                        $dockerfile->splice(1, 0, [$arg]);
+                    }
+                }
             } else {
                 // Only add preview environment variables that are available during build
                 $envs = $this->application->environment_variables_preview()
@@ -2903,6 +2914,17 @@ private function add_build_env_variables_to_dockerfile()
                         $dockerfile->splice(1, 0, ["ARG {$env->key}={$env->real_value}"]);
                     }
                 }
+                // Add Coolify variables as ARGs
+                if ($this->coolify_variables) {
+                    $coolify_vars = collect(explode(' ', trim($this->coolify_variables)))
+                        ->filter()
+                        ->map(function ($var) {
+                            return "ARG {$var}";
+                        });
+                    foreach ($coolify_vars as $arg) {
+                        $dockerfile->splice(1, 0, [$arg]);
+                    }
+                }
             }
 
             if ($envs->isNotEmpty()) {